Last edited by Fejas
Monday, November 16, 2020 | History

2 edition of Numerical studies of compressibility effects in rotating imploding liquid liners found in the catalog.

Numerical studies of compressibility effects in rotating imploding liquid liners

D. L. Book

Numerical studies of compressibility effects in rotating imploding liquid liners

D.L. Book, and P.J. Turchi

by D. L. Book

  • 253 Want to read
  • 37 Currently reading

Published by Naval Research Laboratory in Washington, D.C .
Written in English

    Subjects:
  • Controlled fusion,
  • Plasma confinement,
  • Trapped-particle instabilities

  • Edition Notes

    SeriesNRL memorandum report -- 3699
    ContributionsTurchi, P. J, Naval Research Laboratory (U.S.). Plasma Physics Division
    The Physical Object
    Paginationiii, 51 p. :
    Number of Pages51
    ID Numbers
    Open LibraryOL17961535M

    () Effects of numerical anti-diffusion in closed unsteady flows governed by two-dimensional Navier-Stokes equation. Computers & Fluids , () Assessment methods for electric and magnetic fields in low and intermediate frequencies related to Cited by: Thermal expansion is the tendency of matter to change its shape, area, and volume in response to a change in temperature.. Temperature is a monotonic function of the average molecular kinetic energy of a substance. When a substance is heated, the kinetic energy of its molecules increases. Thus, the molecules begin vibrating/moving more and usually maintain a greater average separation.   Other research activities include generators that employ explosives to create ultra-high pulsed power for different applications, such as megavolt or radiation sources. Additional topics are the generation of plasmas and magnetized plasmas for fusion, imploding liners, rail guns, etc. Contents: Overviews and Lectures. Forcing for statistically stationary compressible isotropic turbulence and the overall dynamics,16 Compressibility effects are usually studied in high speed flows, but they may also arise control the magnitude of the dilatational effects may also allow studies relevant to both types of compressible flow.


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Numerical studies of compressibility effects in rotating imploding liquid liners by D. L. Book Download PDF EPUB FB2

Get this from a library. Numerical studies of compressibility effects in rotating imploding liquid liners. [D L Book; Peter J Turchi; Naval Research Laboratory (U.S.). Plasma Physics Division.]. The implosion quality is similar to that in fig. 2, with radial compressions of 1 from an initial inner surface diameter of 15 cm.

With liquid sodium-potassium liner implosions, for which the magnetic Reynolds number should be about ten, P.J.

T'urchi et al. / Stabilized imploding liner research compression of magnetic flux will be by: 3. Hence, compressibility effects within the viscoelastic regime may become important and influence resulting flow phenomena. From a physical perspective, the difference between incompressible and compressible flows lies in the propagation of longitudinal acoustic waves transmitted through the by: Ohmic diffusion in a rotating incompressible liner.

The liner motion is calculated from applied surface pressure and body forces, and a self-sustaining cycle is defined by the liner returning to its initial position.

The effects of compressibility on the results are dis-cussed by using a. In the large-eddy simulation of variable-density flows, these processes manifest themselves as subgrid-scale (SGS) terms that interact with the resolved-scale flow.

This paper studies the effect of the variable-density SGS terms and quantifies their relative by: 6. Numerical results are obtained for a prescribed model radial trajectory and presented as a function of the compression ratio and Reynolds number. Analytical treatment The liquid liner is assumed to undergo a flow in the r, 4 plane corresponding to the motion of an infinite hollow cylinder which is imploding while rotating about its by: 1.

swell flow are presented and discussed. To study the effects of compressibility, two alternative equations of state, a linear and an exponential one, are used. A linear equation of state has been employed in previous numerical studies of the compressible extrudate swell flow (Beverly and Tanner ; Georgiou ), by.

Compressibility effects on the Rayleigh-Taylor instability growth between immiscible fluids Article (PDF Available) in Physics of Fluids 16(1) January with 90 Reads How we measure 'reads'Author: Daniel Livescu.

A numerical scheme of study is developed to model compressible two-fluid flows simulating liquid sloshing in a partially filled tank. For a two-fluid system separated by an interface as in the case of sloshing, not only a Mach-uniform scheme is required but also an effective way to eliminate unphysical numerical oscillations near the by: An analytical solution is derived for the two-dimensional, laminar, compressible, planar free jet.

The solution assumes constant pressure, specific heats, and unity Prandtl number and accounts for the effects of heat conduction and viscous dissipation in a self-consistent fashion. Exact closed-form expressions are provided for the streamwise and transverse velocities, temperature, vorticity Cited by: The paper studies the effects Numerical studies of compressibility effects in rotating imploding liquid liners book liquid-liner viscosity on the motion of a rotating imploding circular liner in the realistic limit of large Reynolds number.

It is found that viscous effects are concentrated in a thin boundary layer at the free surface whose thickness is of the order of the inverse of the square root of Reynolds number. The numerical simulation of turbulent flows is a subject of great practical importance to scientists and engineers.

A combined experimental and numerical investigation of the heat transfer characteristics inside an impingement cooled combustor liner heat shield has been conducted. Due to the complexity and irregularity of heat shield configurations, standard correlations for regular impingement fields are insufficient and detailed investigations of local Cited by: Effects of Perforated Liners on Controlling Combustion Instabilities in Annular Combustors.

Guangyu Zhang, Numerical Study on JP/Air Detonation and Rotating Detonation Engine. Koichi Hayashi, Compressibility Effects in Subsonic and Transonic Regimes. Lorenzo. Compressibility Effects on the Scalar Mixing in Reacting Homogeneous Turbulence are affected by compressibility and reaction.

This effect is explained by considering the transport equation for the normalized mixture fraction gradient variance and the relative orientation between the mixture fraction gradient and the eigenvectors of the Cited by: 1. 1. Introduction. Surface texturing is used to enhance the load-carrying capacity of parallel slider bearings and to reduce friction and wear [1, 2, 3].While groove-texture, and in particular spiral-grooved bearings [] and herringbone-grooved bearings [] have been used for several decades, surface microtexturing is a more recent development.

Microtexture is commonly implemented as a dense Cited by: Compressibility effects in a reacting mixing layer. MILLER, T. ISLAND, J. SEITZMAN, C. BOWMAN, Liquid oxygen/hydrogen testing of a single swirl coaxial injector element in a windowed combustion chamber. Numerical study of the transient flow in the driven tube and.

This study focuses on these effects in a typical common rail 6-hole diesel injector accounting for 3D needle movement and flow compressibility effects. Coupled numerical simulations using 1D and 3D CFD codes are used for this investigation.

Previous studies in this direction have already presented a detailed structure of the adopted methodology. We develop an explicit algebraic Reynolds stress model (EARSM) for high-speed compressible shear flows and validate the model with direct numerical simulation (DNS) data of homogeneous shear flow and experimental data of high-speed mixing-layers.

Starting from a pressure–strain correlation model that incorporates compressibility effects, the weak-equilibrium Cited by: Effects of Perforated Liners on Controlling Combustion Instabilities in Annular Combustors. Numerical Study on JP/Air Detonation and Rotating Detonation Engine.

Authors: A. Koichi Hayashi, Nobuyuki Tsuboi, Compressibility Effects in Subsonic and. Many factors, including the diffusion of gas from the liquid into the bubble and the effect of liquid compressibility, mitigate this result.

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Breitschwerdt, J. Feige and C. Dettbarn, Numerical studies on the link between radioisotopic signatures on. Such an arrangement for stabilizing a liquid metal liner implosion is shown schematically in Fig. 1 for a system called Helius2 at NRL, c.

This system uses an annular free-piston, driven axially by high pressure helium, to displace the inner surface of a rotating liquid inward onto a volume of trapped gas and/or magnetic flux.

Numerical Study of the RT Mixing in the Deceleration Phase of an Implosion Lili Wang, Min Yang and Shudao Zhang. Experimental and Numerical Investigation of the Impact of Gas Channel Configuration on the Performance of a Small Scale PEM Fuel Cell Murphy K.K.

Lai, Xiang Wu, Sherman C.P. Cheung, John Andrews. Numerical Study Of The Compressible Flow Inside A Supersonic Nozzle To 2D 33 II. GOVERNING EQUATIONS For flow compressible, viscous and perfect supposed, the fundamental equations of flow can be given by the following laws: the conservation of mass (1), the conservation of momentum (2) and the conservation of energy (3).

Exact Computation of the Axial Vibration of Two Coupled Liquid-Filled Pipes. Arris S. Tijsseling. PVP Numerical Study of Tube Array Vibrations Under Cross Flow. Bra An Elementary Study of SPH-Based Simulations for Free Surface Flows With Gravity and Compressibility Effects in Cylindrical Confinement.

Guillaume Oger, Erwan. Experimentally, such implosions have been demonstrated with liners formed within rotating implosion chambers. The present work uses a scale-model experimental apparatus to investigate the possibility of creating liner rotation by tangential injection of the liquid liner material.

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T1 - Experimental study of compressible turbulent mixing layers. AU - Goebel, Steven G. AU - Dutton, J Craig. PY - /4. Y1 - /4. N2 - Compressible, turbulent mixing layers have been investigated experimentally using pressure measurements, schlieren photographs, and velocity measurements with a two-component laser Doppler velocimeter by: Cavitation is a phenomenon in which rapid changes of pressure in a liquid lead to the formation of small vapor-filled cavities in places where the pressure is relatively low.

When subjected to higher pressure, these cavities, called "bubbles" or "voids", collapse and can generate shock wave that is strong very close to the bubble, but rapidly weakens as it propagates away from the bubble. «Numerical optimization of fan tonal noise control using acoustic modulation of slowly-rotating obstructions».

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Magnetically driven imploding liner systems can be used as a source of shock energy for materials equation of state studies, implosion driven magnetized plasma fusion experiments, and other similar applications. The imploding liner is a cylinder of conducting material through which a current is passed in the longitudinal direction.

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Numerical Analysis of High-Velocity Element Formation Upon Implosion of Combined Semisphere-Cylinder Liners; Application of a Soil Model in the Numerical Analysis of Landmine Interaction with Protective Structures; Lethality Assessment of High Explosive (HE) Warhead with Preformed Fragments; Experimental Studies of Scalable Effects Warhead.

We have studied forced turbulence of compressible magnetohydrodynamic (MHD) flows through two-dimensional simulations with different numerical resolutions. First, hydrodynamic turbulence with Mach number 〈M s 〉 init ≡ 〈v〉 rms /c s = 1 and density compression 〈δρ/ρ〉 rms ≃ was generated by enforcing a random by: compressibility effects have to be explicitly considered, a new model for the compressible dissipation was introduced into the closure.

This model is based on a low Mach number, asymptotic analysis of the Navier-Stokes equations, and on direct numerical simulations of compressible, isotropic turbulence.

National Advisory Committee for Aeronautics: Compressibility effects on the longitudinal stability and control of a pursuit-type airplane as measured in flight / (Washington, D.C.: National Advisory Committee for Aeronautics, []), also by William N.

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